Buckle for safety belts



FIG. 1 is a front perspective view of my new design relating to a buckle for safety belts;

FIG. 2 is a rear perspective view of my new design;

FIG. 3 is a front view of my new design;

FIG. 4 is a rear view of my new design;

FIG. 5 is a left side view of my new design;

FIG. 6 is a top view of my new design; and,

FIG. 7 is a bottom view of my new design. 

The ornamental design for a buckle for safety belts, substantially shown in the accompanying drawings. 